Propeller pitch control system
AssigneeSafran Aircraft Engines
InventorAlain Pierre Garassino
Life of this patent
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Abstract
A control system for controlling the pitch of a propeller, the system including a propeller shaft, a blade swivel device having a rotary control element suitable for placing the blades in an angular position corresponding to a desired propeller pitch, and a transmission presenting an outlet member coupled in rotation with the rotary control element of the blade swivel device. The transmission includes a variable speed drive having drive, control, and outlet rotors that are coupled in rotation respectively with the propeller shaft, with a control member, and with the outlet member of the transmission. With the variable speed drive, the speed of rotation of the outlet member of the transmission is a predetermined function of the speeds of rotation not only of the propeller shaft, but also of the control member.
Claims17
A control system for controlling pitch of a propeller, the propeller having blades designed to be driven in rotation by a propeller shaft, each blade being configured to pivot about a substantially radial axis of the blade, the system comprising:
- the propeller shaft;
- a blade swivel device comprising a rotary control element suitable for placing the blades in an angular position corresponding to a desired propeller pitch as a function of rotation of said rotary control element relative to the propeller shaft;
- a transmission presenting an outlet member that is coupled to rotate with the rotary control element of the blade swivel device;
- and
- a variable speed drive;
- wherein
- the variable speed drive has a drive rotor, a control rotor, and an outlet rotor;
- said drive, control, and outlet rotors are coupled to rotate respectively with a drive member that is the propeller shaft, with a control member, and with the outlet member of the transmission, and consequently speeds of rotation of the drive, control, and outlet rotors are proportional respectively to the speeds of rotation of the drive, control, and said outlet members of the transmission;
- the variable speed drive is configured to drive the outlet rotor in rotation at a speed that is a predetermined function of the speeds of rotation of the drive and control rotors;
- and
- the outlet rotor is coupled to rotate with the outlet member via an epicyclic geartrain having two planet gears meshing with each other, carried by the propeller shaft, and meshing respectively with the outlet rotor of the variable speed drive and with the outlet member of the transmission.
A control system for controlling pitch of a propeller, the propeller having blades designed to be driven in rotation by a propeller shaft, each blade being configured to pivot about a substantially radial axis of the blade, the system comprising:
- the propeller shaft;
- a blade swivel device comprising a rotary control element suitable for placing the blades in an angular position corresponding to a desired propeller pitch as a function of rotation of said rotary control element relative to the propeller shaft;
- a transmission presenting an outlet member that is coupled to rotate with the rotary control element of the blade swivel device;
- and
- a variable speed drive;
- wherein
- the variable speed drive has a drive rotor, a control rotor, and an outlet rotor;
- said drive, control, and outlet rotors are coupled to rotate respectively with a drive member that is the propeller shaft, with a control member, and with the outlet member of the transmission, and consequently speeds of rotation of the drive, control, and outlet rotors are proportional respectively to the speeds of rotation of the drive, control, and outlet members of the transmission;
- the variable speed drive is configured to drive the outlet rotor in rotation at a speed that is a predetermined function of the speeds of rotation of the drive and control rotors;
- and
- the variable speed drive comprises a magnetic gear.
A control system for controlling pitch of a propeller, the propeller having blades designed to be driven in rotation by a propeller shaft, each blade being configured to pivot about a substantially radial axis of the blade, the system comprising:
- the propeller shaft;
- a blade swivel device comprising a rotary control element suitable for placing the blades in an angular position corresponding to a desired propeller pitch as a function of rotation of said rotary control element relative to the propeller shaft;
- a transmission presenting an outlet member that is coupled to rotate with the rotary control element of the blade swivel device;
- and
- a variable speed drive;
- wherein
- the variable speed drive has a drive rotor, a control rotor, and an outlet rotor;
- said drive, control, and outlet rotors are coupled to rotate respectively with a drive member that is the propeller shaft, with a control member, and with the outlet member of the transmission, and consequently speeds of rotation of the drive, control, and outlet rotors are proportional respectively to the speeds of rotation of the drive, control, and outlet members of the transmission;
- the variable speed drive is configured to drive the outlet rotor in rotation at a speed that is a predetermined function of the speeds of rotation of the drive and control rotors;
- and
- said drive, control, and outlet rotors are coaxial, and of them, the control rotor, is an outer rotor.
Dependencies are inferred from the claim text.